// Since this op is the BASIC kernel only, constrain it.
    ConfinedAttr<
      DefaultValuedOptionalAttr<TFL_LSTMKernelTypeAttr, "mlir::TFL::LSTMKernelType::BASIC">,
      [TFL_LSTMKernelTypeEqualsTo<"mlir::TFL::LSTMKernelType::BASIC">]>:$kernel_type
  );

  let hasOptions = 1;

  let results = (outs TFL_2DTensorOf<[F32, QUI8]>:$activ_output,

  // expected-error @+1 {{'tfl.lstm' op attribute 'kernel_type' failed to satisfy constraint: lstm_kernel_type whose value is mlir::TFL::LSTMKernelType::FULL}}